rt0_linux_loong64.s

Documentation: runtime

     1// Copyright 2022 The Go Authors. All rights reserved.
     2// Use of this source code is governed by a BSD-style
     3// license that can be found in the LICENSE file.
     4
     5#include "textflag.h"
     6#include "cgo/abi_loong64.h"
     7
     8TEXT _rt0_loong64_linux(SB),NOSPLIT|NOFRAME,$0
     9	// In a statically linked binary, the stack contains argc,
    10	// argv as argc string pointers followed by a NULL, envv as a
    11	// sequence of string pointers followed by a NULL, and auxv.
    12	// There is no TLS base pointer.
    13	MOVW	0(R3), R4	// argc
    14	ADDV	$8, R3, R5	// argv
    15	JMP	main(SB)
    16
    17// When building with -buildmode=c-shared, this symbol is called when the shared
    18// library is loaded.
    19TEXT _rt0_loong64_linux_lib(SB),NOSPLIT,$168
    20	// Preserve callee-save registers.
    21	SAVE_R22_TO_R31(3*8)
    22	SAVE_F24_TO_F31(13*8)
    23
    24	// Initialize g as nil in case of using g later e.g. sigaction in cgo_sigaction.go
    25	MOVV	R0, g
    26
    27	MOVV	R4, _rt0_loong64_linux_lib_argc<>(SB)
    28	MOVV	R5, _rt0_loong64_linux_lib_argv<>(SB)
    29
    30	// Synchronous initialization.
    31	MOVV	$runtime·libpreinit(SB), R19
    32	JAL	(R19)
    33
    34	// Create a new thread to do the runtime initialization and return.
    35	MOVV	_cgo_sys_thread_create(SB), R19
    36	BEQ	R19, nocgo
    37	MOVV	$_rt0_loong64_linux_lib_go(SB), R4
    38	MOVV	$0, R5
    39	JAL	(R19)
    40	JMP	restore
    41
    42nocgo:
    43	MOVV	$0x800000, R4                     // stacksize = 8192KB
    44	MOVV	$_rt0_loong64_linux_lib_go(SB), R5
    45	MOVV	R4, 8(R3)
    46	MOVV	R5, 16(R3)
    47	MOVV	$runtime·newosproc0(SB), R19
    48	JAL	(R19)
    49
    50restore:
    51	// Restore callee-save registers.
    52	RESTORE_R22_TO_R31(3*8)
    53	RESTORE_F24_TO_F31(13*8)
    54	RET
    55
    56TEXT _rt0_loong64_linux_lib_go(SB),NOSPLIT,$0
    57	MOVV	_rt0_loong64_linux_lib_argc<>(SB), R4
    58	MOVV	_rt0_loong64_linux_lib_argv<>(SB), R5
    59	MOVV	$runtime·rt0_go(SB),R19
    60	JMP	(R19)
    61
    62DATA _rt0_loong64_linux_lib_argc<>(SB)/8, $0
    63GLOBL _rt0_loong64_linux_lib_argc<>(SB),NOPTR, $8
    64DATA _rt0_loong64_linux_lib_argv<>(SB)/8, $0
    65GLOBL _rt0_loong64_linux_lib_argv<>(SB),NOPTR, $8
    66
    67TEXT main(SB),NOSPLIT|NOFRAME,$0
    68	// in external linking, glibc jumps to main with argc in R4
    69	// and argv in R5
    70
    71	MOVV	$runtime·rt0_go(SB), R19
    72	JMP	(R19)
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